let score = window.prompt("请输入分数","60");
score = parseFloat(score);
document.write(score);
switch (true) {
    case score >= 80 && score <= 100:
        document.write("太强了");
        break;
    case score >= 60 && score <80:
        document.write("还行");
        break;
    case score >= 0 && score < 60:
        document.write("臭小子回家等死吧你!")
        break;
    default:
        document.write("不要乱搞!");
}
